I think Dahlia is the standout here-- Dorothy and Mabel are too frumpy next to lovely Nina, Ophelia is gorgeous but too out-there compared to Nina, and while Nadia is lovely, repeating first initials bother me, too. I'd keep working to get your DH to agree to Dahlia! I pronounce it the way you like (I'm on the west coast but from the east.) DahliaFaye would be gorgeous.